How to make a aggregate function in bird ?

[Xavier Beaudouin]

Hello,

I am attempting to make some intelligent stuff on one lab bird. I am sorry if
this has been already asked since I do not have very mutch experience about
bird, and some of my google:// didn't find what I am looking for.
 
My idea is to find which aggregate I have within a bunch of subnet I have.

For example :

get_aggregate( 192.0.2.1/32 ) will return 192.0.2.0/24

Is there any nice way to make such function ?
 
Also in the same work I would like to find how old is the route received in BGP.
 
Any good pointers or examples are really appreciated.

Kind regards,
Xavier